An annotated bibliography example shows you more than a list of sources. It shows each source, a short summary of what it says, and a brief note on why it matters for your work.
If you have never written one before, the format can look confusing at first. This guide makes it simple. You will see how an annotation is built, look at short APA and MLA examples, and learn the steps to write your own with confidence.
In This Guide
What Is an Annotated Bibliography?
An annotated bibliography is a list of sources on one topic, where each source is followed by a short paragraph called an annotation. The list is often the first step in a larger research project.
It helps you sort your sources before you start writing. You can see which sources agree, which disagree, and which ones are most useful for your argument.
The Three Parts of Each Annotation
Every annotation has three parts. First comes the citation, written in the style your instructor asks for, such as APA or MLA. Second comes a short summary of the source, in your own words. Third comes an evaluation of its usefulness or credibility.
The summary tells the reader what the source covers. The evaluation tells the reader why it can be trusted, or where its limits lie. Together, they show that you have read and judged the source, not just copied its title.
How It Differs From a Simple Reference List
A normal reference list gives only the citation for each source. An annotated bibliography adds the summary and the evaluation after each citation. That extra paragraph is the whole point of the task.
Annotated bibliographies are common in coursework, and they also feed into longer work. In a thesis, the sources you annotate often shape the literature review chapter of a dissertation structure. For wider support, see our literature review help page.
Annotated Bibliography Example in APA
In APA style, the citation uses an author-date format. The author’s surname comes first, followed by the year in brackets. The annotation then starts on the next line, indented as a single paragraph.
The sample entries below are invented examples for format only, not real sources to cite. Do not copy them into your own reference list.
How APA Citations Look
An APA book citation gives the author, year, title in italics, and publisher. A journal article citation adds the journal name, volume, and page numbers. The annotation that follows should stay focused and in your own words.
Smith, J. (2020). Learning in the digital age. Academic Press.
This book explores how online tools change the way students study and revise. Smith argues that short, regular study sessions work better than long, last-minute sessions. The book is useful because it draws on classroom studies, though it focuses mainly on undergraduate students.
A Second APA Sample
Journal articles follow a similar pattern, with the article title in normal text and the journal title in italics.
Smith, J., & Lee, A. (2021). Study habits and exam results. Journal of Learning Research, 15(2), 45–58.
This study compares the exam results of students who used planned revision with those who did not. The authors found that planned revision was linked to higher scores. The large sample makes the findings useful, but the study covers only one subject area.
Annotated Bibliography Example in MLA
In MLA style, the citation uses an author-page format for in-text references, and the Works Cited entry gives the author, title, container, and publication details. The annotation is still a short paragraph after the citation.
For full citation rules, the Purdue OWL is a trusted guide to both APA and MLA formats. Always check it against your instructor’s own rules, since some teachers add their own tweaks.
How MLA Citations Look
An MLA book entry lists the author, the title in italics, the publisher, and the year. The annotation below it follows the same three-part pattern: citation, summary, and evaluation.
Smith, John. Learning in the Digital Age. Academic Press, 2020.
This book explores how online tools change the way students study and revise. Smith argues that short, regular study sessions work better than long, last-minute sessions. The book is useful because it draws on classroom studies, though it focuses mainly on undergraduate students.
What Stays the Same in MLA and APA
The citation format changes, but the job of the annotation does not. In both styles, you must summarise the source fairly and judge its value for your topic. Keep the tone neutral, and do not add your own new argument in the annotation.
Check your assignment sheet for line spacing and indent rules before you submit.
How to Write Each Annotation Step by Step
Follow the same steps for every source, one at a time.
Step 1: Read and Note the Main Points
Read the source once for the main idea, then again to note the research question, method, and main findings. Write these notes in your own words, so you avoid copying phrases by accident.
Step 2: Write a Short Summary
Start your annotation with a plain summary of what the source says. Aim for a few clear sentences. Name the topic, the main argument or findings, and any key evidence the author uses.
Step 3: Add Your Evaluation
Next, judge the source. Is the author an expert? Is the evidence strong? Is it recent enough? Note any limits, such as a small sample or a narrow focus.
Finish by stating how the source helps your own work. One sentence is often enough. For a full walkthrough of the wider writing process, read our guide on how to write a dissertation.
Step 4: Check Length and Format
Each annotation is typically 150-200 words long, though instructors vary, so check your assignment before you start. Count your words, check your citation format, and make sure every annotation follows the same pattern.
Trim any annotation that is much longer than the others.
Common Mistakes to Avoid
Most small errors are easy to fix once you know what to look for.
Copying Instead of Summarising
The most common mistake is copying sentences from the source. Always write the summary in your own words. If you must quote a short phrase, use quotation marks and cite it correctly.
Writing Only a Summary
A summary alone is not enough: without the evaluation, the reader cannot tell whether the source is strong or relevant.
Mixing Up Citation Styles
Do not mix APA and MLA in one list. Pick the style your instructor asked for and use it for every entry. Check author names, dates, italics, and punctuation one entry at a time.
If you are unsure about a tricky citation, look it up rather than guessing. A page on annotated bibliography help can point you to format guidance for your style.
Frequently Asked Questions
What is an annotated bibliography?
An annotated bibliography is a list of sources where each citation is followed by a short annotation. The annotation summarises the source and evaluates its usefulness or credibility.
How long should each annotation be?
Each annotation is typically 150-200 words long. Instructors vary, so check your assignment instructions for the exact length they expect.
What is the difference between APA and MLA annotated bibliographies?
APA and MLA differ in citation format and layout. APA uses an author-date format, while MLA uses an author-page format, but both styles use a citation followed by a summary and an evaluation.
Do I need to read the whole source before writing the annotation?
Yes, you should read enough of the source to summarise it fairly and judge its value. Skimming only the abstract can lead to a weak or inaccurate annotation.
Can I use the same annotation style for every source?
Yes, use the same citation style, length, and structure for every entry. A consistent list is clearer to read and easier for your instructor to mark.
Struggling With Your Annotated Bibliography?
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- Annotated Bibliography Help — expert guidance, structure help, and editing support for annotated bibliographies.
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About the Author
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